Position Description
15 INTEGRAL A3
16 External auxiliary heater (INTEGRAL A3 < INTEGRAL A2)
The calculation of the integral value does not stop during hot water production or when pool heating is pro-
duced.
8.5.9 HYSTERESIS
In order to start the heat in advance during sudden changes of the heat demand, there is a value, HYSTERESIS,
which controls the difference between the actual supply temperature, t
1
and the calculated supply temperature,
t
2
. If the difference is equal to or greater than the set HYSTERESIS value (x), i.e. there is a heat demand, or the heat
demand disappears, quicker than the usual integral calculation, the integral value is forced to either the start value
(-60) INTEGRAL A1 or to the stop value (0).
Figure 5. Conditions for HYSTERESIS to force the integral value to change.
Position Description
1 Integral
2 Supply temperature
3 t
1
4 t
2
5 Time
6 Compressor stop (0)
7 Compressor start (-60)
8 Hysteresis (Δt) ≥ x
9 Hysteresis (Δt) ≥ x
8.5.10 DEFR CURVE
During operation the air heat exchanger is cooled by the energy exchange, at the same time the humidity causes it
to become covered in frost at low outdoor temperatures. DHP-AQ has an automatic function to defrost the air heat
exchanger using the energy from the house's heating system.
Defrosting is initiated by low temperature in the refrigerant circuit after the air heat exchanger and, among other
things, is dependent on outdoor temperature, humidity and operating time. The length of defrosting varies
depending on the extent of freezing of the air heat exchanger. Defrost continues until the air heat exchanger is
free of ice and the temperature in the refrigerant circuit after the air exchanger has risen to the desired tempera-
ture. After completed defrosting the heat pump returns to the operating mode before defrosting.
44 – Installation instructions VMGFD102
To Next Page
Loading...
Need help?
General